Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2014

Journal or Book Title

Green Chemistry

Volume

16

First Page

627

Last Page

636

DOI

10.1039/C3GC41314D

Abstract

A techno-economic analysis of mild catalytic pyrolysis (CP) of woody biomass followed by upgrading of the partially deoxygenated pyrolysis liquid is performed to assess this pathway’s economic feasibility for the production of hydrocarbon-based biofuels. The process achieves a fuel yield of 17.7 wt% and an energy conversion of 39%. Deoxygenation of the pyrolysis liquid requires 2.7 wt% hydrogen while saturation of aromatic rings in the pyrolysis liquid increases total hydrogen consumption to 6.4 wt%. Total project investment is $457 million with annual operating costs of $142 million for a 2000 metric ton per day facility. A minimum fuel selling price (MFSP) of $3.69/gal is estimated assuming 10% internal rate of return. Twenty-nine percent of the capital outlay is the result of including a co-generation system to consume heat generated from burning part of the off-gases from pyrolysis and upgrading and all of the coke during regeneration of catalysts. Forty-five percent of the MFSP arises from the cost of biomass feedstock. Hydrogen required for the upgrading process is generated using the balance of the process off-gases.

The analysis reveals that an optimum design would include a cogeneration unit; however using natural gas for hydrogen generation is more favorable than using process off-gases as the feed. An uncertainty analysis indicates a probable fuel price of $3.03/gal, demonstrating the potential of the CP pathway as an alternative to petroleum-derived transportation fuels.

Comments

This is a manuscript of an article from Green Chemistry 16 (2014): 627, doi: 10.1039/C3GC41314D. Posted with permission.